We initially contacted your sales team and they said to raise this with you.
The question we have is: How do we add fonts so they are available to be selected in the Customiser and other areas of the theme such as when editing content, going to the unyson page etc. Note, we have manually enabled the font we wanted via CSS. However, it is a patchwork solution which is not ideal, especially for making/managing changes.
If you are not a developer then you can consider hiring a developer to develop it for you. You can hire a developer from any freelance site. Shufflehound recommends the developer https://www.upwork.com/freelancers/~011652ffec8865c6d5